Keep in mind that, what I'm trying to achieve is to to input a large list of URIs through a function into the query in the Supermetrics Queries tab (we've done it numerous times with the TODAY() function in the End Date field). We've also tried implementing the following solution:

"For getting more results from Moz and improving performance, you should get your own API credentials from Moz and add them to your request. Once you have the credentials, you use them by adding "APIKEY_X&Y" (where X=Access ID and Y=Secret key) to Options: Advanced settings on the add-on sidebar, or to the Settings column in SupermetricsQueries. With this setting, Moz queries will be done using your own API credentials"

using temporary keys, to no result.

Even if we try to check 7-8 pages, we receive the aforementioned error.